J107 - Tawas update Q2 2023

 

29 June 2023 - A view of the under construction Tawas station.

15 June 2023 - An aerial view of Tawas station.

Further north at contract J107, is the second station under contractor CES_SDC's purview - Tawas. Located next to Cleantech Park, the station will serve the Jurong Innovation District area as well as the southeastern part of Nanyang Technological University. We take a look at how the site has progressed over the past quarter.

8 April 2023 - A view of the Pan Island Expressway (PIE) between Gek Poh & Tawas stations.

8 April 2023 - Structure of Tawas station slowly coming up at the start of Q2 2023.

8 April 2023

8 April 2023 - A close up view of the structure for Tawas station.

8 April 2023 - Piers for Tawas station further north.

8 April 2023

8 April 2023 - Glimpses of the ongoing viaduct construction work.

8 April 2023

8 April 2023

8 April 2023 - A view of viaduct piers under construction at the former Pioneer Primary School.

8 April 2023 - A viaduct pier for the special span across the expressway.

8 April 2023 - Viaduct piers within the former Pioneer Primary School area as seen from Gek Poh
under construction.

29 June 2023 - Viaduct construction near Nanyang Crescent.

29 June 2023 - A movement joint pier and viaduct spans under construction.

29 June 2023 - Viaduct piers just north of Tawas station.

29 June 2023 - A close up view of the viaduct pier where the crosshead was recently cast.

29 June 2023 - Close up view of the movement joint pier, north of Tawas station.

29 June 2023 - Completed viaduct spans as they enter the Nanyang Technological University area.

29 June 2023 - Construction of the foundation & pile cap of a portal pier north of Tawas station.

29 June 2023 - Progress of works at Tawas station.

29 June 2023 - Several pier columns have been cast at concourse level.

29 June 2023 - The special span viaduct pier can be seen across the expressway at Gek Poh.

Structural works
The station & viaduct are progressing swiftly with works on the structures coming along. Much of the station has been built up to the concourse level, with several pier columns extending up to the platform level. As the station will straddle a future road to be built beneath, the structure of the station is somewhat different in design from other stations built in the road median with 3 rows of piers supporting the station concourse slab. Due to the greenfield nature of the site, work is progressing quicker than at other stations being built in the road medians.

Viaduct construction is also progressing well, with several spans completed. Unfortunately, some of the views are obstructed by the trees within the Nanyang Technological University (NTU), hence the resulting images do not really show the completed viaduct spans very visibly. Compared to earlier in the year though, the progress made has been quick with several spans already completed. Work is still ongoing for other viaduct piers southwards, nearer the Tawas station.

To get to Gek Poh station, the line will need to cross the busy Pan Island Expressway (PIE). For ease of construction, it appears that piers will be built on either side of the expressway and segments for the special span crossing built across using the balanced cantilevered method. Some of the segments for the special span crossing over the PIE were seen at the casting yard.

28 May 2023 - A view of the contract J107 casting yard.

28 May 2023 - A close up view of the contract J107 casting yard. A double-cell segmental
box girder (SBG) which is larger than a typical SBG. This will be used for the special span
crossing where the line traverses the PIE.

28 May 2023 - A close up view of the double-cell SBG.

15 June 2023 - A view of the double-cell SBG in the contract J107 casting yard.

Casting yard
The casting yard for the contract is co-located with those for neighbouring contracts next to the Tengah depot site. Over the last few months of the quarter, a large double-cell segmented box girder (SBG) could be seen being cast. This SBG will likely be used for the special span crossing over the PIE. It is very much larger in size than a typical SBG and also supports two trackways as opposed to the typical SBG supporting a single trackway.

This post is also available on Instagram & Facebook from 14 July 2023.